Floor Squeaks

What is the best way to get rid of floor squeaks? For the upstairs, I am pulling back the carpet and running screws through the plywood floors and into the floor joists. For ths 1st floor, I was thinking of shimming the joists from the basement, as access is easy due to no ceiling.

Any suggestions?
Do floor squeaks = poor construction?

According to the builder, it is common and due to wood expansion rates. Is this true?

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Although the builder is partially right, your answer is more accurate. Squeeks happen when the subfloor is not fastened properly. Rough carpenters typically use the cheapest nails and miss the joists now and then. The subfloor should be gapped 1/8" in most cases. Add exposure to rain and dampness and of course nails pop.

Builder should go through and re-screw the entire subfloor before any flooring is installed. But, that costs money and most don't bother. I always recommend sneaking in and re-screwing all the floors before they're covered.

I agree....it is your subfloor and less likely anything to do with the wood floors. I am betting they didnt gap the subfloor. I cant tell you the 1000's of new homes that I have been in over the last couple of years that have no gaps in the sub floor.

What about LIQUID NAILS that is for subfloors? I can access the underneath joists in the basement and run the bead within the area of the sub floor and the joist. It is a small space but if I can get the two to be GLUED together.